"Baby dolphin" is not an official name yet. It may have been referenced in the storyline as such, but has not been officially named. Alternatively, it may be a name popular among fans, but has no official basis.
Like many dolphins, the baby dolphin is very playful.
The baby dolphin looks a lot like a normal baby dolphin. Her skin and eyes are pink, and her underside is light pink. She's most likely based on the Amazon river dolphin which can vary in color from pink to gray.